PR binutils/13897

	PR binutils/13897
	* elf.c (elf_find_function): Cache last function sym info.
	(_bfd_elf_maybe_function_sym): Return function size, pass in
	section of interest.
	* elf-bfd.h (struct elf_backend_data <maybe_function_sym>): Likewise.
	(_bfd_elf_maybe_function_sym): Likewise.
	* elf64-ppc.c (ppc64_elf_maybe_function_sym): Likewise.
	(opd_entry_value): Add in_code_sec param.  Revert caching code.
	Return -1 if in_code_sec and function found in wrong section.
	Update all calls.